Bottlenose Dolphins Breathe Air but Can Sleep in the Ocean

question 33

Multiple Choice

Bottlenose dolphins breathe air but can sleep in the ocean because

• A) they cease breathing while sleeping and remain underwater.
• B) they sleep for only 30 minutes at a time, which is the maximum interval they can cease breathing.
• C) they fill their swim bladder with air to keep their blowholes above the surface of the water while they sleep.
• D) they move to shallow water to sleep, so they do not need to swim to keep their blowholes above the surface of the water.
• E) they alternate which half of their brains is asleep and which half is awake.

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